Made alot of headway and it is driveable now. After street tuning I dialed in the 383 on a chassis dyno. It made 383 hp and 399 tq uncorrected and 412 hp and 431 tq std corrected on a 102F day. Peak torque happened at 3,100 rpm and peak hp was 5,600. I need to change the fuel pump so that I can dial it in on E85, its begging for higher octane and more timing. I made peak power with a very conservative advance curve and 91 octane.

I flushed the ac system, changed the compressor to a Sanden 4261, swapped in a parallel flow replacement condenser and went with a variable orifice tube up front from Rockauto. I added a PCM controlled 16" 3,000 cfm puller and a cutdown Duramax fan on a Trailblazer SS thermal fan clutch. Went back to a stock radiator and an 01-02 fan shroud. Really made everything fit better. Using a factory 01+ Donaldson designed GM air cleaner housing and it is plumbed with a 4" intake and 102mm cartridge style LS3/LS7 MAF. I get 41°F air out of the left vent at idle in 102F temps and the engine stays around 185°F. I recently updated the fan clutch to an electronically controlled clutch. The clutch fan is on the PCM fan 2 output via a relay that supplies it 12v. When the engine first starts and the interior is hot the fan clutch locks up and really drops the ac pressures, then as the interior cools down and the pressures drop the mechanical fan returns back to the lower rpm setting. If it warms up to 189F the clutch is locked in. It usually holds around 185F with the clutch released and the 3,000 cfm electric on.


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'